Ear-trumpet.



H. HAMANN.

EAR TRUMPET.

APPLiCATlON FILED MAYI5.1S16.

Patented A r. 29,1919.

W/ TNESSES HENRY HAMANN, OF CHICAGO, ILLINOIS.

EAR-TRUMPET.

Specification of Letters Patent.

Patented Apr. 29, 1919.

Application filed May 15, 1916. Serial No. 97,591.

To all whom it may concern:

Be it known that I, HENRY HAMANN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Ear-Trumpets, of which the following is a specification. I

My invention relates to that class of devices which are designed to aid a defective sense of hearing by applying amplified sound directly to the human ear, and more particularly to the type known as ear trumpets, which consist of a sound receptacle and a tapering passage leading from said receptacle to a small outlet adapted to be placed in the ear.

The objects of my invention, are first, to attain a greater degree of efficiency, 2'. e. to

ain as great or a greater degree of amplification with a small, convenient instrument than that ordinarily attained by a larger and corres ondingly more inconvenient instrument.

econd, purity of tone, 2'. c. that the amplified sound shall be clear and distinct, retaining its original qualities unadulterated. Third, convenience. Fourth, sanitation.

I attain these objects best by the combination illustrated in the accompanying drawing, in which Figure 1 is a; sectional elevation through the center of the instrument in the plane of the tapering sound passage.

Fig. 2, is a detail in elevation of the diaphragm, which is the principal feature of my invention, from a plane at a right angle to Fig. 1, in the direction indicated by an arrow.

Referring to Fig. 1, A is the sound chamber or receptacle, preferably of one piece of metal, drawn cylindrical in form, the upper end, A closed, the lower or open end, A curled inwardly, the edge of the metal spaced a sufficient distance from the body of the shell to permit the insertion of the diaphragm. A perforation, A is made in the side to accommodate the sound passage.

The diaphragm, B, may be composed of any of several materials having the necessary qualities, chief of which is hardness and lively resiliency. The body is conical in form, its upper or closed end, B spherical or dome shaped. The lower or open end, B a diameter to fit into the base, A, of the receptacle. A perforation, B is made in the side to accommodate the sound passage.

The sound passage, C, preferably of metal. round in cross section and tapering throughout its length, is assembled in the receptacle, A, with the larger end, C facing the closed end A of the receptacle. Passing downward and curving outward it passes through the opening, B in the side of the diaphragm and A in the receptacle, thence curving upward and then outward and terminating at the small end in a threaded portion, C

The sound passage, C, must be securely fastened to the receptacle, A, and carefully sealed at the perforations A and B The dome shaped end B of the diaphragm B, is interposed between the closed end A of the receptacle A, and the larger end C of the sound passage 0, while the lower end B is securely fastened to the base A of the receptacle and thoroughly sealed so as to maintain an airtight compartment between the diaphragm and the receptacle.

D, is the ear tip, composed of hard rubber or similar material, formed to fit into the human ear; having a perforation approxi mately the size of the opening in the small end of the sound passage and a thread to fit the threaded portion, C of the sound passage, this construction permitting of removal for cleaning.

I prefer to coat the outside of the metal parts with rubber or other material, E, having the ability to reduce or eliminate vibration of said metal parts. This coating adds to the appearance and is also a protective measure.

The operation is as follows: Sound vibrations entering the receptacle strike the diaphragm which acts as a sounding board, adding resonance; the dome shaped end densifying and projecting the sound into the pies sage in which it is further densified, emerging at the tip, it produces a powerful effect on the organs of hearing.

Many modifications of my invention may be constructed, for instance,The operation may be reversed, 2'. e. the sound vibrations may enter at the small end of the passage, strike the diaphragm and be projected into the sound chamber as applied to a phonograph, megaphone, telephone, etc.

The coating, E, may be dispensed with and other means, such as a change in the material composing the receptacle and passage substituted.

The essential element of m invention being a diaphragm used in com ination with a sound chamber and passage, I make no claim for novelty in the use of the receptacle and sound passage separately. However, I do ear; a diaphragm having a dome shaped end not Wish to be limited to the precise construcinterposed between said closed end of said tion shown and described, but What I claim receptacle and the larger opening of said 15 and desire to secure by Letters Patent, is: passage, said diaphragm being formed With 5 An ear trumpet, comprising a receptacle or a conical body extending to the base or open chamber, said receptacle having its upper end of said receptacle and securely sealed end closed; a tapering passage leading out of thereto. said receptacle, saidpassage having its larger HENRY H AMANN portion extending into sald receptacle; its 10 larger opening facing the closed end of lVitnesses:

said receptacle, said passage also carrying on E. J. NEWTON, its small end means adapted to the human J. T. RICE.

Copies of this'patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

